/*
 * Copyright 2019-2020 Chair of Geoinformatics, Technical University of Munich
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.rtron.math.range

import com.google.common.collect.BoundType as GBoundType

/**
 * Bound types of intervals.
 * See wikipedia article of [intervals](https://en.wikipedia.org/wiki/Interval_(mathematics)).
 */
enum class BoundType {
    /** open bound, such as the lower bound in (3,5] */
    OPEN,
    /** closed bound, such as the upper bound in (3,5] */
    CLOSED,
    /** no bound, such as the upper bound in [3, ∞) */
    NONE
}

// Conversions

/** Conversion from Guava Bound Type class. */
fun GBoundType.toBoundType() = when (this) {
    GBoundType.OPEN -> BoundType.OPEN
    GBoundType.CLOSED -> BoundType.CLOSED
}

/** Conversion to Guava Bound Type class. */
fun BoundType.toBoundTypeG(): GBoundType? = when (this) {
    BoundType.OPEN -> GBoundType.OPEN
    BoundType.CLOSED -> GBoundType.CLOSED
    BoundType.NONE -> null
}
